i have an iphone 4 carrier locked with 7.1 version, i wanna use gevey sim on it, how can i degrade its verion to lower one.
Actually there was a tool released for the iphone 4 to allow it to boot multple iOS versions.
The iphone 4 can always be jail broken as well due to the chip and kernel exploits.
OP
Check at reddit.com for more info.